Patent GB-760883-A (GB)
Title: Improvements in calculating machines
IPC: G06C15/14
Filed: 1954-10-07
Abstract: 760,883. Calculating-apparatus. AKTIEBOLAGET ATVIDABERG-FACIT. Oct. 7, 1954 [Oct. 8, 1953], No. 28959/54. Class 106 (1). In a ten-key machine, the setting- up mechanism is adapted also to register the calculating operation, e.g. multiplication or division, so that operation is effected by setting the two factors with the operation symbol interposed, and the item indicator displays the operation symbol between the two factors. The invention is applied to a machine having a cam-disc and pin-wheel actuator A for the totalizer, an actuator D for the multiplier register or revolution counter C, and a setting mechanism B adapted to set the actuators A and D. The setting mechanism B comprises a series of toothed rings 61 journalled on discs 60 held together by bolts 64 and mounted on a screwed shaft 65 by which the assembly is shifted denominationally. The rings 61 have external teeth 61b for engagement with a single keyboard operated setting-wheel 73 and with the actuators A and D, and internal teeth 61c for engagement with a toothed actuating roller 68 and a resetting roller 67. The digit symbols 0-9 are marked on the peripheries of the rings at 61a, with the multiplication symbol interposed between the " 0 " and 1," these symbols being visible at an item indicator opening 66. As the digits of a multiplicand are keyed in turn, the assembly B is shifted step-wise to the left by shaft 65, and the rings 61 are successively set by the wheel 73, set rings 61 passing into denoninational alignment with the actuator A. A final step of movement of the assembly B relative to the actuator A is effected when the operation symbol is next keyed, whereafter the actuators A and D follow (see below) the stepwise movement of the assembly B and relative to the multiplier register C during keying of the multiplier or other second factor, the ring 61 registering the operation symbol lying between the actuators A and D. When both factors have been set on the assembly B, the actuating roller 68 is rotated counterclockwise (Fig. 2), which advances set-rings 61 further counterclockwise to transmit the first factor to the actuator A and the second factor, through the wheels 85 of the actuator D, to the multiplier register C. Finally, the actuators A and D are shifted back half a step and the roller 68 turned back clockwise, so that the assembly B is restored to set position registering the two factors and operation symbol, the actuator D is reset at zero, whilst the actuator A and register C remain set, being disengaged by the half-step shift. The resetting roller 67 is journalled on a reduced extension of the roller 68 and is rotated clockwise (Fig. 1) to zeroize the rings 61 successively during the accumulating operation. Step-wise follow-up movement of the actuators A and D is obtained by means of a notched bail 74 which is rocked counterclockwise, when the operation symbol is keyed, to engage lugs 60b on the end discs 60 of the assembly B. The bail 74 then moves step-wise with the assembly B and, in so doing, cams a bail 79 counterclockwise to actuate a starting shaft 82 for the drive to a screw 101 adapted to step-shift the actuators A and D. The bail 79 moves with the actuators A and D, and is rocked into its active position by the bail 74 to initiate shift of the actuators A and D each time the assembly B is shifted by its screw 65.